{"id":57,"date":"2007-08-20T13:05:26","date_gmt":"2007-08-20T04:05:26","guid":{"rendered":"https:\/\/www.diamondsandopals.com\/blog\/diamcalc-and-ideal-scope-to-the-rescue\/"},"modified":"2021-07-25T12:33:13","modified_gmt":"2021-07-25T04:33:13","slug":"diamcalc-and-ideal-scope-to-the-rescue","status":"publish","type":"post","link":"https:\/\/www.jogiadiamonds.com.au\/blog\/diamcalc-and-ideal-scope-to-the-rescue\/","title":{"rendered":"DiamCalc and Ideal-Scope To The Rescue!"},"content":{"rendered":"<p>The <a href=\"https:\/\/www.diamonds.net\/news\/NewsItem.aspx?ArticleID=18544\">recently patented<\/a> <a href=\"https:\/\/www.diamond-cut.com.au\/holloway_cut_adviser.htm\">Holloway Cut Adviser <\/a>(HCA) is an online tool that helps consumers determines the cut of a diamond. It is simple and free, but not without it&#8217;s flaws.<br \/>\n<!--more--><\/p>\n<p>Due to it&#8217;s over simplicity, another piece of software, <a href=\"https:\/\/www.ideal-scope.com\">DiamCalc<\/a> can be used when making a final decision when purchasing a diamond based on proportions alone. DiamCalc costs US$395 (thus should be purchased by the seller), but has a a huge array of features including Ideal-Scope and AGS ASET image generation and photo-realistic models.<\/p>\n<p>To illustrate the benefits of DiamCalc, take a diamond with the following proportions:<\/p>\n<ul>\n<li>36.5 degree crown angle<\/li>\n<li>40 degree pavillion angle<\/li>\n<li>57% table<\/li>\n<li>61.5% total depth<\/li>\n<li>Pointed culet<\/li>\n<\/ul>\n<p>Plugging these into the Holloway Cut Adviser yields an excellent result &#8211; a 0.8:<\/p>\n<p align=\"center\"><img decoding=\"async\" title=\"Holloway Cut Adviser\" src=\"https:\/\/www.jogiadiamonds.com.au\/images\/hca.jpg\" alt=\"Holloway Cut Adviser\" \/><\/p>\n<p align=\"left\">Bear in mind, this diamond was given a &#8220;Very Good&#8221; cut grade by the GIA. Therefore, either the GIA cut grading system is flawed, or the HCA is flawed.<\/p>\n<p align=\"left\">On further inspection, DiamCalc produced the following Ideal-Scope image:<\/p>\n<p align=\"center\"><img loading=\"lazy\" decoding=\"async\" title=\"DiamCalc Ideal-Scope Image\" src=\"https:\/\/www.jogiadiamonds.com.au\/images\/diamcalc-hca.jpg\" alt=\"DiamCalc Ideal-Scope Image\" width=\"414\" height=\"379\" \/><\/p>\n<p align=\"left\">And the actual Ideal-Scope image:<\/p>\n<p align=\"center\"><img loading=\"lazy\" decoding=\"async\" title=\"Actual Ideal-Scope Image\" src=\"https:\/\/www.jogiadiamonds.com.au\/images\/is-hca.jpg\" alt=\"Actual Ideal-Scope Image\" width=\"272\" height=\"242\" \/><\/p>\n<p align=\"left\">Note that both DiamCalc and the Ideal-Scope produced similar images which pointed to the fact that this diamond looked &#8220;dark&#8221; beneath the table &#8211; not quite the &#8220;Excellent&#8221; grade that the HCA had given it.<\/p>\n<p align=\"left\">One of the main tenets of the HCA is that a large crown angle will be OK, if the pavilion is shallow and vice-versa. Known as the inverse crown-pavilion theory, it is described <a href=\"https:\/\/www.hollowaydiamonds.com.au\/crown-and-pavilion-angles\/\">here<\/a>. However, as we&#8217;ve just seen, there are limits to that theory. Sure, a 41.0 degree pavilion angle and a 34.0 degree crown angle work well together, but it&#8217;s a bit far fetched to say a diamond with a 36.5 degree crown angle and a 40.0 degree pavilion angle is &#8220;Ideal&#8221;.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The recently patented Holloway Cut Adviser (HCA) is an online tool that helps consumers determines the cut of a diamond. It is simple and free, but not without it&#8217;s flaws.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-57","post","type-post","status-publish","format-standard","hentry","category-diamonds"],"_links":{"self":[{"href":"https:\/\/www.jogiadiamonds.com.au\/blog\/wp-json\/wp\/v2\/posts\/57","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.jogiadiamonds.com.au\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.jogiadiamonds.com.au\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.jogiadiamonds.com.au\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.jogiadiamonds.com.au\/blog\/wp-json\/wp\/v2\/comments?post=57"}],"version-history":[{"count":2,"href":"https:\/\/www.jogiadiamonds.com.au\/blog\/wp-json\/wp\/v2\/posts\/57\/revisions"}],"predecessor-version":[{"id":455,"href":"https:\/\/www.jogiadiamonds.com.au\/blog\/wp-json\/wp\/v2\/posts\/57\/revisions\/455"}],"wp:attachment":[{"href":"https:\/\/www.jogiadiamonds.com.au\/blog\/wp-json\/wp\/v2\/media?parent=57"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.jogiadiamonds.com.au\/blog\/wp-json\/wp\/v2\/categories?post=57"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.jogiadiamonds.com.au\/blog\/wp-json\/wp\/v2\/tags?post=57"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}